# C Program for Simple Calculator

In this tutorial, i am going to show you how to create simple calculator program in c programming language using switch case and if else statement.

## All C Programs for Simple Calculator

• C Program for Simple Calculator using Switch Case
• C Program for Simple Calculator using If else

### C Program for Simple Calculator using Switch Case

```#include <stdio.h>
int main() {
char op;
double first, second;
printf("Enter an operator (+, -, *, /): ");
scanf("%c", &op);
printf("Enter first numbers: ");
scanf("%lf", &first);

printf("Enter second numbers: ");
scanf("%lf", &second);
switch (op) {
case '+':
printf("%.1lf + %.1lf = %.1lf", first, second, first + second);
break;
case '-':
printf("%.1lf - %.1lf = %.1lf", first, second, first - second);
break;
case '*':
printf("%.1lf * %.1lf = %.1lf", first, second, first * second);
break;
case '/':
printf("%.1lf / %.1lf = %.1lf", first, second, first / second);
break;
// operator doesn't match any case constant
default:
printf("Error! operator is not correct");
}
return 0;
}```

The result of the above c program; as follows:

```Enter an operator (+, -, *, /): +
Enter first numbers: 5
Enter second numbers: 2
5.0 + 2.0 = 7.0```

### C Program for Simple Calculator using If else

```#include <stdio.h>

int main()
{
char Operator;
float num1, num2, result = 0;

printf("\n Please Enter an Operator (+, -, *, /)  :  ");
scanf("%c", &Operator);

printf("\n Please Enter the Values for two Operands: num1 and num2  :  ");
scanf("%f%f", &num1, &num2);

if(Operator == '+')
{
printf("\n The result of %.2f + %.2f  = %.2f", num1, num2, num1 + num2);
}
else if(Operator == '-')
{
printf("\n The result of %.2f - %.2f  = %.2f", num1, num2, num1 - num2);
}
else if(Operator == '*')
{
printf("\n The result of %.2f * %.2f  = %.2f", num1, num2, num1 * num2);
}
else if(Operator == '/')
{
printf("\n The result of %.2f / %.2f  = %.2f", num1, num2, num1 / num2);
}
else
{
printf("\n You have enetered an Invalid Operator ");
}

return 0;
}```

The result of the above c program; as follows:

```Please Enter an Operator (+, -, *, /)  :  *
Please Enter the Values for two Operands: num1 and num2  :  5 2
The result of 5.00 * 2.00  = 10.00```

Categories C